From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Hutchings Subject: Re: Puzzling driver problem Date: Tue, 12 May 2009 13:32:19 +0100 Message-ID: <1242131539.3935.17.camel@deadeye> References: <4A08F777.6040605@dlasys.net> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: dhlii@dlasys.net Return-path: Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:50153 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754433AbZELMcX (ORCPT ); Tue, 12 May 2009 08:32:23 -0400 In-Reply-To: <4A08F777.6040605@dlasys.net> Sender: netdev-owner@vger.kernel.org List-ID: On Tue, 2009-05-12 at 00:13 -0400, David H. Lynch Jr. wrote: > I am working on a driver for the Xilinx Local Link Fifo Temac. > It is based on an earlier driver for very similar hardware that uses > a scatter gather DMA engine rather than a FIFO. > 95% of the code is common. > The FIFO code is also tested independently in a bootloader and works > fine there. > > The problem I am having is that after the driver and linux load. > HTTP requests to the busy box web server hang after just a few HTTP > packets. > > Many other protocols seem to be working just fine. I can send > thousands of pings and get responses, > I can SSH to the embedded linux running the driver. > Using a packet sniffer (wireshark) aside from the HTTP stalling, > nothing looks extrodinary. > Other packets are getting through and being replied [...] Is it possible that you are setting the maximum frame length incorrectly? HTTP is likely to use maximum-length frames for responses whereas ping, SSH (aside from file transfer) and TFTP will use smaller frames. Ben. -- Ben Hutchings, Senior Software Engineer, Solarflare Communications Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked.